Wrist pin



April 29, 1930.

R. c. BAKER WRIST PIN Filed Jam.` 5o, 1929 INVENTOR. EueE/v C. BAKER. @WM Wad fw A TTORNE YS.

Patented Apr. 29, 1930 REUBEN C. BAKER., F CALINGA, CALIFORNIA WRIST PIN Y Application led January 30, 1929. Serial No. 336,047.

This invention relates to a wrist pin for connectingv a pitman rod to a crank in a well pumping ring. f

It is the principal object' of the present invention'to provide an improved wrist pin for connecting apitman rod to a crank, which wrist pin can be expeditiously connected or disconnected from the pitman, affords a lubricated anti-friction bearing for the pitman,

lo and in addition, permits the crank to turn in either direction without disrupting the connection between the crank and the wrist pin.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the vaccompanying drawing, in which:

Figure 1 is a view'in elevation and section of a wrist pin embodying the preferred form of my invention. l

Figure 2 is a fragmentary View of the same, disclosing the manner in which the cap is secured in position.

Referring more particularly to the accompanying drawing, 9 indicates a wrist pin having two bearing portions 10 and 11. `These portions are located aty opposite ends of the pin and are separated by an annular flange 12. The end 10 of the wrist pin is designed to be inserted through a crank while the end 11vis adapted to be received by the pitman rod bearing. The outer end of the crank end 10 of the wrist pin is formed with adjacent threaded portions 15 and .16. The threads of these portions 15 and 16 are of different 35. leads. These threaded portions 15 and 16 receive nuts 17 and 18and when the nuts are in place clamping the pin 9 in a crank bearing the Vprovision of the double threaded portions permits the crank to be run in both 0 directions without working'the nuts 17 and 18 loose.v

The outer extremity of the pitman end 11 of the wrist pin is reduced in kdiameter as at 19 and is formed with al threaded portion 2O contiguous to the bearing portion. A collar 21 is arranged on the reduced portion 19 intermediate the threaded, portion 2O and the end of the pitman bearing portion 11. The collar 21 just referred to abuts against the shoulder formed by the different diameters vand it is counterbored to accommodate the of the portions 19 and 11. vThe collar 21 is clampedin this position by a nut 22 which is threaded on the threads 2() of the reducec shank 19.

The collar 21 and the flange12 cooperate 55,v in confining a bearing sleeve 23 in positiolil on the portion 11 of the wrist pin. Rollers 24 are arranged between the Asleeve 23 and the exterior surface of the portion 11 to form an antifriction bearing for the pitman G0 Washers or retainer rings 25 are arranged at the ends of the rollers 24 as illustrated. The bearingvsleeve 23 is slightly less in length than the space between the flange 12 and the collar 21. This permits the sleeve to revolve freely. The sleeve is also slightly larger in exteriordiameter than the exterior diameter ofthe collar 21 so that the pitman bearing will' not bear on the collar. Y Y

In order to retain the pitman bearingrin place on the'wrist pin, I providea retainer collar 26. VThis retainer col-lar is bored .to fit over the reduced end 19 of' the wrist pin nut 22. Aso thatits inner face may abut against 5 the collar 21. At this inner face the retainer collar is formed with an enlarged circumscribing flange 27 of a diameter substantially the same as the diameter of the flange 12.

'Theseflanges 12 and 2'? abut against the ends 80 Y ofthe pitman bearing and retain the samein placeI on the wrist pin. I To lock the retainer collar in position itv is formed with sockets 28 'arranged on the outery face of the retainer collar and at dia;l metrically opposed points. These sockets are adapted to receive theV ends of a locking pin 29.y This locking pin is removably projected through a transverse hole drilled through the lwrist pin. The engagement between the pin andthe sockets 28 prevents both axial and rotary movement ofl the retainer collar' relative tothe wristpin. v A

In actual practice the parts are constructed as illustrated and' all are assembled with lthe 95 exception of the nuts 17 and 18 and the retainer collar 26 and the pin 29. The endlO f of the wrist pin is then engaged with the crank-bearing and the nutsk 17 and 18 are threaded on.thethreadedsections- 15 and 16 100 to clamp the wrist pin in place relative to the crank. As the nuts 17 and 18 are threaded on threaded portions having threads of different leads, the crank may turn in either direction without any risk of loosening the nuts.

The pitman bearing isY then arranged on the anti-friction `bearing of the wrist pin.

he retainer collar isthen arranged in place to secure the pitinan bearing between it and the flangel. The pin 29 vis inserted through the reduced end 19Vwith its ends engagingA the sockets in the retainer collar. This locks the retainer collar in position.

To lubricate the anti-friction bea-ring, a

vlubricating passageway is formed axiallyl through the end 1l ofthewrist pin and then radially to the anti-friction bearing. A lubricatingfitting may be disposed at the end v of the wrist pin in communication with this passageway so thatlubric'ant may be forced through the passageway to the bearinfr; i

Y I desire'to vpoint out that the arrangement of the retainer collar 26 Aon the wrist pin is such that it is only necessary to removev the pin-29 and then slip the retainer collar of'fof Y the wrist pin inV order to disconnect the piterly lubricated. v

.man from thev wrist pin. Likewise, it is a simple-matter to reconnect the wrist pin.` Y y v Y I also desire to point out that by my present construction I provide ananti-friction bearing vfor the pitman rod and provide means enabling this anti-friction vbearing to be proppitinan to the While I have shown the preferred form of my invention, lit is to be understood that variv ous changes maybe made in its construction the appended claims.`

by those skilled in thebart without departing from the spirit of the inventionas deiined in Y Having thus described iny invention, what I-claim and desire to secure'by Letters Patentis: Y y 1 V' 1. l. A wrist pin comprising a wrist; pin body, a flange. arranged intermediatethe ends of the same to divide the body into a crank bearing portion and a pitman bearing portion, theouter vextremity of the pitman bearing portion being reduced in diameter, a sleeve arranged over the pitman bearing portion, a plurality of rollers interposed between the sleeve and the v.pitman bearing portion, means retaining the sleeve and rollers in position, aretainer collararranged over the reduced end', said retainer collar having. va flange cooperating with the flange Von the body to retain a pitman bearing there-VV between, said retainer collar having sockets atH its outerv end', and a pin removably pro- ]ecting through the'reduced end and engaging said sockets to retain the collar in position.-`"v V2. A wristY pin comprising a wrist pin body portion, a flange formedthereon dividing the having-a circuinscribing flange to cooperate with the other flange to retain a pitman bearing therebetween, and means removably'securing said retainer collar inposition.v

3. A wrist pin comprising a wrist pin bodyV portion, a flange formed thereon dividing the same .into a crank bearing portion anda pitinan bearing portion, the eXtreinity'of the pitman bearing portion-being reducedv and formed with a threaded portion, a collar Varranged over the reduced end, a nut engaging the 'threads to clamp the collar in position, a'

sleeve rotatablydisposed'between the collar and the flangeand retained in position thereby, rollers arranged intermediate the sleeve and the body, a retainer collar fitting over the reducedv end-and the nut and abutting x against the other cellar, said retainer collar `95 having a circumscribing flange tocooperate with the other flange to retain a pitman bearing therebetweemineans removably securing said retainer collar in position, said means'j comprising. sockets formed vin the -outer end of the vretainer/collar, Vand a pin adaptedftok be projected diametrically throughthe reduced end and engage said sockets.

4. A wristpin comprisiiigawrist pin body i portion, aflange Vformed thereon dividing the same into a crank bearing portion and a pitman bearing portion, the extremity ofthe pitinan bearing Vportionibeing reduced and formed with a Vthreaded portion, a collar arranged over the reduced end, a nut enga-ging the threads to clamp the collar in position,

a sleeve rotatably disposed between the collar and the flange and retained in position thereby, rollers Varranged intermediate the sleeve and the body, a retainer collar fitting over the reduced end and the nut and abutting against the other collar, said' Vretainer collar havinga circumscribing flange toy cooperate with the other flange to retain a pitmanbeartherebetween, means removably securing said retainer collarin position, the extremity of the crank bearing portion being formed with adjacent threaded portions. hav'ii'ig threads of different leads, and nuts to engage c said threaded portions to clamp a crank bearing between the liange and nuts.

5. v`A wrist pin comprising a wristpin body,

Va flange circumscribing the same intermediate its ends dividing the wrist pin body into a crankbearing portion and a pitman bearing portion, the extremity of t-he pitman bearing portion being reduced in diameter and formed with a threaded portion, a collar fitting between the threaded portion and the larger portion, a nut threaded on the threaded portion ofthe reduced end and clamping said collar against the larger portion, a sleeve arranged over the body intermediate the collar and the flange, said sleeve being slightly less in length than the distance between the collar and the flange, said sleeve being slightly larger in diameterl than thecollar, rollers interposed between the sleeve and the wrist pin body to provide an anti-friction bearing, a retainer collar bored to receive the reduced end and counterbored to accommodate the nut whereby its inner end will abut against the collar, said inner end of the retainer collar being formed with a flange to cooperate with the flange on the Wrist pin body to relar in position.

clamp a crank bearing between them and the outer extremity of thepitman bearing por-` tion being reduced in diameter, a sleeve'arranged over the pitman bearing portion, a

plurality of rollers interposed between the sleeve and the pitman bearing portion, means retaining the sleeve and rollers inV position, a retainer collar arrangedover the reduced end, said retainer collar having a flange cooperating with the flange on the body to retain a pitman bearing therebetween, and means removably securing'said retainer col- REUBEN c. BAKER.

tain a pitman bearing therebetween, said retainer collar having sockets formed at its outer end, said reduced end having a dialnetrically extending bore adapted to align with said sockets when the retainer collar is in position, and a pin adapted to be projected through said bore and engage said sockets to retain the retainer collar in position.

6. A wrist pin comprising a'wrist pin body, a flange circumscribing the same intermediate its ends dividing the wrist pin body into a crank bearing portion and a pitman bearing portion, the extremity of the pitman bearing portion being reduced in diameter and formed with a threaded portion, a collar fitting between the threaded portion and the larger portion, a nut threaded on the threaded portion of the reduced end and clamping said collar against the larger portion, a sleeve arranged over the body intermediate the collar and the flange, said sleeve being slightly less in length than the distance between the collar and the flange, said sleeve being slightly larger in diameter than the collar, rollers interposed between the sleeve and the wrist pin body to provide an anti-friction bearing, a retainer collar bored to receive the reduced end and counterbored to' accommodate the nut whereby its inner end will abut against the collar, said inner end of the retainer collar being formed with a flange to cooperate with the flange on the wrist pin body to retain a pitman bearing therebetween, said retainer collar having sockets formed at its. outer end, said reduced end having a diametrically extending bore adapted to align with said sockets when the retainer collar is in position, a pin adapted to be projected through said bore and engage said sockets to retain the retainer collar in f position, the extremity of the crank bearing 

